refactor: bỏ LQIP nhánh chuyển cảnh (không hiển thị), giữ blur-up cảnh đầu

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/components/VirtualTour.tsx

@@ -1653,11 +1653,6 @@ function TourExperience({
         if (cachedTexture) {
           prepareTransitionTexture(cachedTexture);
         } else {
-          const lqipTexture = loadLqipTexture(scene.image);
-          if (lqipTexture) {
-            transitionMaterial.map = lqipTexture;
-            transitionMaterial.needsUpdate = true;
-          }
           loadPanoramaTexture(scene.image, (progress) => {
             if (transitionTokenRef.current === token) {
               setLoadProgress(progress);